Britney Spears' ex husband KEVIN FEDERLINE has reportedly launched a legal battle to stop his ex dating a British photographer. The Toxic hitmaker sparked rumours of a romance with Adnan Ghalib after spending the night with him in a Los Angeles hotel last month (Dec07). But Federline is said to be unhappy with his former wife's new lover and has started investigating Ghalib's immigration status. A source tells British newspaper The Sun, "Kevin and his legal team want to get Britney away from him. They are concerned she has completely lost all sense of reality. "Dating a photographer who has tailed her for months is like sleeping with the enemy. Kevin's team want him sent home if he hasn't got his papers in order." Spears reportedly described Ghalib as her "only friend" after she was admitted to hospital following a stand-off with police at her Los Angeles home last week (ends04Jan08).